Device for truing connecting rods



July 10, 1923.

W. C. C ORYELL DEVICE FOR TRUING CONNECTING RODS Filed June 5. 1922 v A; a. W

Patented July 10, 1923.

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DEVICE FOR"TRUING CONNECTING Eons.

Application fi led June5, 1922. Serial No. 566,000.

To all whom it may concern:

Be it known that I, WILLIAM C. CORYELL a citizen of the United. States, residing at Wayne, in the-county .of Wayne and State of Nebraska, have invented, certain new and useful Improvements in Devices for Truing Connecting Rods; and I do declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improved de-- vice which is especially designed for truing internal combustion engine connecting rods. The principal object of the invention is to generally improve upon devices of this class by providing one of extreme simplicity and durability, which is such as to permit the rod to be gaged to render its axis coincident with the'axis of the piston head and to permit the rod to be corrected or trued while connected to this device, the latter being such that it overcomes the usual practice of maintaining the rods on the crank shaft and truing them when in this part.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawings forming a part of this specification and in which like numerals are employed to designate like parts throughout the same:

Figure 1 is an elevational view showing the manner of using the improved device.

Figure 2 is a sectional view taken substantially on the plane of the line 2- 2 of Fig. 1.

Figure 3 is an enlarged side elevational view of the improved device removed from the vise.

Figure 4 is a top plan view of said device.

Figure 5 is a transverse section taken on the line 5-5 of Fig. 3.

Figures 6 and 7 are detail perspective views disclosing supplemental details sometimes used in connection with the device.

In the drawings the letter B represents a bench on which a conventional type of vise V is rigidly secured. It is with this vise that the improved connecting rod truing device is especially adapted to be associated. As is customary, a conventional type of square or gage G will be used to ascertain whether or not the axes of the connecting rod and piston are in the proper alinement. So that a clear understanding of the invention may be obtained, I have also disclosed) .a conventional -piston head and "connecting rod R which are to be acted on.

' The invention resides, as before indicated, in an improved device for use in connection with the parts so far described. Although this device could be of some other construction,it.preferablycomprises a single metal body having a flat face or substantially square intermediate portion 1 with cylindrical stub-axles 2 projecting from its opposite ends. As is clear from the drawings, the part of the body 1 is designed to be clamped between the jaws of the, vise so that a portion thereof projects beyond the jaws to form a seat for the gaging instrument G. To permit convenience of use of such instrument, the upper face of the flat faced portion of'the body is formed with a groove 3 in which a portion of the square is slidably received. This arrangement insures proper positioning of the gaging instrument.

As is evident from the drawing, when it is desired to true or place the axis of a connecting rod R in alinement with the'axis of a piston head P, the bearing of the connecting rod is slipped over one of the axles 2.. Assuming that the part 1 ofthe body has been tightly clamped between the jaws of the vise so that the square can be arranged in said groove 3, it will be seen that the, user can quickly ascertain whether or not the axes of the parts P and R are in proper alinement. If not, a suitable wrench can be engaged with the connecting rod 1 and it can be straightened or trued so that its axis will coincide with the axisof the piston head. In some instances. the diameters of the connecting rod bearings vary to some extent and if desired, in practice, the two stub-axles may be of difierent diameters. However, it is suggested to employ split bushings 4 to be slipped over the stub axles and to be received in theconnectingrod bearings so as to permit effective use of the invention with bearings of different di ameters. Particular emphasis is laid on the construction, wherein the gaging implement. is permitted to be slid toward and from the work and at all times held in proper posi-. tion. Furthermore, with the device, the

connecting rod can be removed from the 1 ,sition thereon. This is another feature to be very carefully considered.

By carefully considering the description in connection with the drawings, persons familiar with devices of this class will doubtless be able to obtain a clear understanding of the invention. Therefore, a more lengthy and detailed description -is deemed unnecessary.

Since probably the best results may be obtained with the construction and arrangement herein shown and described this is taken as the referred embodiment of the invention. owever, I wish it to be understood that minor changes coming within the scope of the invention as claimed may be resorted to if desired.

I claim:

A device for truing and alining the axes of a connecting rod and a piston fitted thereon comprising a one-piece metal body having a substantially oblong intermediate fiat faced portion adapted to be clamped between the jaws of a. vise, the upper face of said portion being formed with a longitudinal groove extending through the ends thereof, said groove being designed to accommodate a portion of a gaging instrument, and cylindrical stub-axles extending from the ends of said oblong part, one of said axles beingdesigned' to extend through the bearing of said connecting rod, the axles being of different diameters to accommodate the different sizes of bearings.

In testimony whereof I have hereunto set my hand.

WILLIAM C. CORYELL. 

